Question

Dik=Sisi bawah=8cm
Tinggi=7cm
L=168
Dit=Sisi Alas ......?

Answer 1

Luas = (a+b)/2 x t
168 = (a+8)/2 x 7
336 = (a+8) x 7
336 = 7a + 56
7a = 336 - 56
     = 280
  a = 280/7
    = 40 cm